Lock-stitch sewing-machine.



`E.- ERICKSON. V -LOGK STITCH SEWING MACHINE. I APPLICATION FILED DEC.28, T912- *Y 1,137,198. l Patented Apr. 27,1915.

. 8 SHEETS-SHEET I- ,f,

.- LERICKSON. 4LocK sTITcH'sEwIIIIG- MACHINE. APPLICATION FILED I )Ec.28, I9I2. I ,1137,198. www@ Apr. 27, 1915.

' IISIIIEETSTSIIEET 2.

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E. ERICKSON.

LocK STITCH SEWINGA MACHINE. APPLICATION FILED DEC-28, I9I2.

Patent@ Apr. 27, 19.15.

8 SHEETS- SHEET 3.

E. ERICKSON.l Lock smcH'sEwmG MACHINE.

Patented Apr. 27, 1915.

Afeuclqloulmro Dc.2a. 1912. 1,137,198-, w

8 SHEETS-SHEET 4.

E. ERICKSON.

LocK smcH'sEwaNG MAcHms. APPLICATON FILED DEC.28| 1912. Y

Patenten Apr. 2'?, 1915.

8 SHEETS-SHEET 5.

E. ERICKSON.

LOCK STITCH SEWING MACHINE.

APPLICATION FILED DEC.28, ISIZ. I 1,137,19., Patented A111227, 1915.

8 SHEETS-SHEET 6.

E. ERICKSON.

LOCK STITCH SEWING MACHINE.- APPLICATION FILED Dacia, 1912.

Patented Apr. 27, 1915 8 SHEETS-SHEET 7.

@ff a @wfgg'.. 53%- //////////h m ELERiCKS-ON.

LOCK STITCH SEWiNG MACHINE.

L M om. 2 C. E D D E L H N o .H A c U DI P A U 8 9 1l .Q 7 Quv 1 0' 1l Patented Apr. 27, 1915.

. 8 SHEETS-SHEET 8.

v. Q SEF .of Fig. 1: Fig. is an elevation unrrnn sra'rns earner Ormea.

EDWARD ERICKSON, OF WEST LYNN, MASSACHUSETTS, ASSIGNOR, BY DIRECT AND MESNE ASSIGNMENTS, TO SACHUSETTS, A .CORPORATION OF vieron SHOE iviAonrNnnY COMPANY, Or BOSTON, Mes- MAssAeHUsn'rTs.

LOCK-STITCH SERVING-MACHINE.

Specification Of Letters Patent.

Patented Apr. 27, 1915.

To all 'Hzomit m 0.1/ concern Be it known that I. .EDWARD ERICKSON, a citizen o'r` the United States, and resident of lVest Lynn, in the count7 of Essex and State of Massachusetts; have invented certain new and useful Improvements in Lock- Stitch Sewing-Machines, of which the following is a speciiication.

This invention relates to machines for sewing heavy material suclryas leather, and refers particularly to that type of such machines known as welt sewing machines.

One of the objects of the invention is to provide a machine of this character which will enable repair work to be done on shoes where it is desired to continue the seam well along the shank toward the heel of the shoe that is being repaired. Aor start sewing close to the heel.

Further Objects are to provide an improved needle-actuating mechanism and preferably through which the awl is also oscillated; to provide for a dwell in the motion of the needle so as to release the thread to avoid liabilitjvY of the shuttle stripping the thread; to provide means carried by the needle support for making the loop; to provide an improved parallel har motion operating mechanism for driving the shuttle; and to provide further improvements which l .shall now proceed to describe and claim.

f the accompanying drawings: Figure 1 is a iront elevation of the machine complete; Fig. .2 is an elevation from the le'l't l 'from the right oi Fig. 1, hut with portions at the eX- treme right o1' said figure broken away;

Fig. f1 is a viewsimilar to Fig. il; but illustrating more in detail the mechanism bchindparts shown in Fig. 3; Fig. is a part elevation in part section on a vertical line substantially micfhvavof the machine; Figs. Ll and 5 are in *fact elevations ot' parts which would appear it the u'mchauism shown in Fig. l were divided substantially centrally and opened ont: Fig. lf3 a plan view of the machine: Fig. 7 is a detail elevation, of one of' the cams shown in Fig. (l. nur in a ditterent position OF rotation: Fig. S is a detail elevation of the shuttle and its support; Fig. 9 represents a section on line 0 4) of Fig. S; Fig. 10 a view simila r to Fig. 9; 'ont shewing the bobbin support turned outwardly; Fig. 11 represents a section on line 11-11 of Fig. 8 on an enlarged scale: Fig. 12 represents a section On line 12-12 oit Fig. 11, and also On line 1Q12 of Fig. 8, but on a larger scale than Fig. 8; Fig. 13 is a detail elevation of the presser t'oot and its bar and operating mechanism; Fig. 1st is a View similar to Fig. 13, but looking in the Opposite direction; Fig. 15 is a detail View, partly in section, of portions of the machine hereinafter described; Fig. 16 is a detail View of the thread lock; Fig. 17 represents aseetion on line 17-17 ot Fig. 16; Fig. 18 represents a section on line 18-18 of Fig. 16; Fig. 19 represents a section on line 19-19 Ot Fig. 1; Fig. 2O represents a section on line 20-20 of Fig. 19; Fig. 21 is a detail, partly in section, Ot' some of the Operating parts hereinafter described; Fig. 22 represents a section on line 22-22 of Figi 21; Fig. 23 is a detail view illustrating the construction and Operation of the take-up.

Similar reference characters indicate the same or similar' parts in all of the views.

"lhe base Oil` the machine is provided with two uprights or standards 81, 32, said base being made in two parts, as indicated in Fig. 1, the standards having suitable abutting portions, to enable tie screws Or bolts 33 to be passed through said abutting portions and the two parts of the base to hold the frame of the machine rigidly together.

The main shaft Si is supported in a bearing 35 iii the standard 3l and in a bearing 3G carried by a bracket 37, which is bolted to the sideot the standard Said main shaft has a driving pulley 3S at one end and at its other end provided with a spiral gear 39 meshing with a pinion Ll() secured to a shaft tl mounted in a bracket i9 supported b3* the top of the standard B1. The. gear 39 and pinion 40 are as 3 to 1.-

The opposite ends of the shaft -tl are provided with cranks 13; Lil. substantially at an angle ot JOO to cach other. shaft 45 also mounted in the bracket is provided with cranks 4G, 47 at substantially an angle of .100 to each other. A pitman 1S connects the cranks 43 and 4G. and a pitman Lil-9 connects the cranks JA amL -i-7. rVlie pitman 4:9 has an extension or "niger 50, the extreme tip ot which forms or carries a lateral -pin 5l which enters a recess 52 in the shuttle 53 (Figs. 2 and 4). The connections just described, including the arallel links 48,49, .y imparta smoot uni orm motion tothey'.

. shuttle to rotate the latter three times to formed in the two-part bearing bracket 55,

56, these two parts of the bearing bracket being formed to present a circular support for the shuttle, one side of the support being open of course to permit the loop of needle thread to be engaged by the hook of the shuttle, carried around the shuttle and removed again therefrom by the take-up. As'shown in Figs. .6 and 8, a screw 57 connects,y the two parts 55, 56 of the shuttle supporting bracket together, attaching bolts 58 secuing the two parts of the, bearing bracket to the inner'face of the standard 31. As best shown in Fig. 6, all of the-parts so far described are arranged and mounted to present the shuttle in a plane tangential to the path of operation of the needle and awl,

The bobbin 59 (Figs. 8, 9 an'd 10) =is rotatably supported upon a pin 60 projectlng from an arm 61 pivoted at 62 t0 .thel

shuttle, said arm 61 having a vheel or lateral projection 63 by means of which, as presently described, the bobbin and its support may be locked in the position shown in Fig. 9. A spring 64 secured atfone end to the shuttlesupporting bracket bears at its other end against the bobbin to hold the bobbin on the pin -60 and also to provide tension to prevent a too free unwinding motion of the bobbin. The heel 63 isL provided with a pin 65 having a flat side and -a round side, as shown in Figs. 11 and 12, said pin 65 being adapted to enter the' recess 67 of the latch bolt 66, which is4 mounted in the shuttle body, a projection 68 at one side of the recess 67 forminga keeper to engage the pin 65 when in the position shown in Fig. 12, and consequently lock the bobbin arm 61 in the position shown in Fig. 9. The engagement of the keeper 68 with the pin 65 is preserved by-a spring 69 confined between the inner end of the latch bolt 66 and the plug 70 threaded into the inner end of the aperture for bolt 66. Whenever it is desired to remove the bobbin for re-winding or to substitute another bobbin for it, pressure against the end of the latch bolt 66 by 'any suitable implement disengages the keeper 68 from the pin 65 so that the operator, by pushing with one inl ger against the side of the bobbin which sustains the pressure of spring 64, may

swing the bobbin and its support to the position shown in Fig. 10 so that-the bobbin can easily be removed from the pin 60. By then simply swinging the f,support 61 from the position shown in Fig. 10 back to the l position shownin Fig. 9, the round side of the pin 65, when it contacts with the keeper 68, acts as a cam to displace the keeper 68 to permit the pin 65 to pass it, after which the spring 69 causes the latch bolt 66 to return to the positionshown in Fig. 12.

The work support 71, provided with the usual slot ofcourse to permit of the feeding motion of the awl, iscarried by the outer end of an arm 72 secured to the stand-- ard 31, as by means of screwsv 73 (Fig. 1).

As shown by comparing Figs. 1, 2 and 6, A

reference being had especially to the latter,

Ait will be seen that the arm of the work sup port has its outer face extending abruptly rearwardly from the portion which supports the work, so that there will be no obstacle to the passage of a shoe being repaired far enough to permit sewing to be done along the shank of the shoe. In other words, the

outer faceofthe work support is so formed' that the heel of a completed shoewhich is being repaired will not interfere with the presentation of the Work to the work support 71 to permit sewing to be carried along thevshank of the shoe. The oint at which the arm 72 is secured to the rame is so far away from the path of movement that would have tobe imparted to the heel'of a,

shoe, and the arm 72 extends outwardly from said point of support at such Aan abrupt angle that neither the work support nor its arm presents any obstacle to sewing as described along the shank of the shoe.

In order that the lframe of the machinewll present no obstacle to the movement of a shoe far enough to permit the seam to be l, started from a point close toothe heel at one *side and to be continued close to the heel at the other side of the shank of a shoe, said frame is recessed, or cut away, .or reduced, as shown at 72 by comparing Figs. 1 and. In brief, the particular form of the work rest illustrated and described, in connection with the cut-away or reduced portion 72a o f the frame, enables a seam to be started and continued along the shank quite close to the heel on repair` work.

The arm 74 having the 'presser foot 75 (Fig. 1) is secured, by means of suitable screws or bolts, in a recess 76 (Figs. 5 and 13) of an arm 77 of a lever, the other arm 78 of whichis formed or provided with a segment rack 79 meshing with a pinion 80.

The lever 77, 78 is pivotally supported on a -disk 84, as by means of a binding screw or bolt 88, said rihg87 having anar-Pf 89 provided with a roll 90 engaging aj'cam groove 91 in one side of a. cam hub 92 carried by the shaft 34, whereby, prior to the feeding of the work, the pin 83 on which the pinion yielding pressure upon the Work, 1 emplojY a spring 93 (Fig. 15), one end of said spring being connected to the pinion and the other end connected to a collar 94, the latter having a series 'of radial rotches 95 in its outer end, with either one of which a pin projecting from pin 853 is adapted to be engaged. The pin and notch construction just described is for the purpose of enabling the. tension of spring 93 to be adjusted so as to force said spring: to act through the pinion 80 and the segment-toothed arm 78 to lower the presser foot 75. l

To effect the locking of the presser foot to hold the work tightly duringr the formation of each stitch. and to release it during the feed of the work, I provide thc following' mechanism. 'lounted upon the sleeve hub S2 of the cam S0 are the two i'etesserl4 hubs 07, 98, a spriirer 05? being located in the rccess and adapted, as presentlj.7 e.\:plaincd,v to act as a brake upon the out-er periphery of the sleeve huh Sii. @ne end of said spring is connected to the hoh 08 and the other to the huh 97. Thr. latter has an arm 100 provided with a pin 101 which enters a slot in an adjustahlv lixcd arm 102 pivotally connected at lo?. to the standard (Fig. 5). The lower end of the. arm 102 i s formed with an arc .slot 104- (Fig. 13) through which a binding screw 1.0.3 passes into the standard. This provides for so adjustabljf securing the arm 102 to rari-.f the, position ot' the hub 97 rotatabljv to slilhtlj,7 .loosen or tighten the brake spring` 90 as may he necessary to insure the accurate operation of said spring` as a brake.

The hul) 9S has an arm 1.00 (Fig. 13) wh`eh is connected by a link 10ir to one arm 109 ot an elbow lever pivoted 'at 109, thc other arm 110 harine a roll which engages a cani groove 111 in the side of the cam disk The, pivot 109 is a pin which extends through the. standard and projects at each end from said standard. being mounted to rsrillate in a hole in said standard. At one end. this pin 109, which is practically a rockshaft, has a pinion (Fig. 5) meshing with a rack 113 carried by a vertically n iovable rod 111, which may be connected'to a' treadle not shown to raise the presser foot when Work is to be introduced. The other end of the rockshaft 109 is provided with a cam-shaped projection 116 (Figs. 3 and 14) which enters an openingr Vin one end of a pivoted arm 117, said arm being pivotally connected at 118 to the arm 110 of the elbow lever. The arm 117 has a roll 119 which bears against the periphery of the cam disk 92, the lat-ter haring a recess or depression 120. As will be readily understood. when the parts occup)y` the relative positions shown in Figs. 13 and 111, the arm 11T forms practically a rigid portion of the arm 110 of the elbow lcrer, the rolls carried by these two arms engaging opposite sides of the rib of the cam disk J2 which separates the cam groove. 111 from the periphery of the cani, and therefore as the cam disk rotates the ell-mw lever .is oscillated, the structure and operation of the parts heine' such that when the operative portion of the cani iroove 111 reaches the roll or arm 110 the, elbow lever is oscillated to ti ghten the brake. spring` Jil (Fig. 15), this octurring.'r during the formation of each stitch. 11s will he explained hereinafter` the operation of the foot treadle rod 11l acts to oseillate the rockshaft 10i) to rotate the cam projection 11H sutliciently to allow relative movement ol" arns 110, 11T so as to permit the j'iresser foot to he raised regardless of the rotative position of the cam disk 9'2.

As best. shown in Fie. 1?. the inner wall of the cam Jroore 111 is provided with a recess 121 which, when it arrives opposite the roll o'l' the arm 110, will 'permit said roll to more toward the axis of rotation ofthe cam disk 92 so as to relieve outward pressure on said roll and thus release the braio ing; etlect ot the brake spring 09 and permit the, presser foot to be lifted.

The take-u p arm 125 (Fig. 5) is pivotallv connected at 123 to one end ot' a shaft 12T, the pi rot connection of the take-up lever or arm beine' eccentric to the axis of the. shaft 127, as shown in Figs. 5 and 13. 'lho bearing for the shaft 127 is indicated at lf3() in Fig. 5. rThe take-up arm is provided with two rolls 12S (Figs. 5 and 23), a roll 19) being stationariljI mounted. The other end of shaft 12T is provided with an arm lill. (Fig. 13) which is sweated or otherwise secured to said shaft, said arm 131 heine# connected by a link 132 with` the arm 'T8 of the presser foot lever. As shown in Fig. 2i-. a roll 133 is stationarily mounted. the needle thread .ft passing! from the thread lock 1731 hereinafter described. and over thc roll 13?, under rolls 128 and to the needle. rl`he stationarj7 roll 199 is in such position that when the taken!) lever mores downwardlv toward and to the position indicated by dotted lines in Vie'. 23, the thread will he taken up in two loops instead of one as cusl tomar-y heretofore, so that the take-up needs tol have imparted to it but one half the usual motion` of throw., The short arm of the take-up lever4 is provided with a roll 135 which is acted upon by a cam 136 (Fig. 4), 5 the take-up lever being actuated so as to keep the roll 135 in contact with the cam by means oa-suitable spring such as indicated at 137 in Fig. 23. The structure just described varies the throw of the take-up according tothe thickness of tlie work; Re-

ferring to, Fig. 13, if the presser foot 75 is heldin a higheriposition than shown, due to the presence of. thicker work between it and the work rest, the connection by means of the link 132 oscillates the shaft 127 so as to shift the position of the pivot ,126, thus changing the position of the fulcrum of the take-up` arm to increase the throw of the .take-up lever.

The structure of the thread lock is best illustrated in Figs. 16, 17 and 18, a stud 138 projecting from the .standard32 having a reduced portion to form a pin 139 on which is mounted, to rotate freely when permitted todo so, a sleeve 140 having anenlarged portion 141 provided with an annular groove 142. A spring 143 isl coiled about the outer surface of sleeve 140 and has o'ne end anchored to the fixed stud 138, the other end being turned outwardly to form-a hook 144 (Figs. 5 and 17). This hook is engaged by a pin 145 projecting from an arm 146 of a @rock-shaft A147, said rockshaft having another arm 148 provided with a roll 149 actuated by acam 150 on the main shaft 34, said cam being cut away, as best shown in Fig. 5,

Y so that when thecutaway portionreaches the roll 149, the rockshafty147 is released so that the pin 145 willmove away from the position shown in saidfigure It is to be underStOQd-thatiwhsn the Parts. are in .the osition shown i;t1,lj`.ig.5, the coil spring v143 1s gripped tiglitglyzuponv theslceve 140 so as to act as a brake. 'l Consequently, when the thread is laid with one or more turns in the groove 142 (Fig. 18) said thread will be practically locked because of the action of l the braking spring 143 until the recessed portion of the cam 1,50 releases it in the manner just described.l

n ,The needle 1 51 has its carrier 152 (Fig. 4) pivotallymountedon thefxed pin 153. The carrierl 152 has a rearwardly projecting 'arm 154 connected by a link 155 with an arm 156 which yis fixedly but adjustably secured to one end ofa rockshaft 157 (Figs. 2, 4, 21 and 22) mountedin'two disks 158, 159 carried -by'a rockshaft 160 which is mounted to oscillatc in a bearing 161 of 1the frame of themachine. y,Said `bearing is cut away 'in the Aform of: l 7 i,uc'slot 162 so,that the rock'- l sha-ft 157can bephiftcdby the oscillation of the,,diskslas-,presently described. The diskv 15,8;and the,1jockshaft v16,() are oscillatedby means of'a pitman 163 (Fig. 2),`the

- l vru :fumi .Y l

upper end of said pitman being formed as an eccentric strap embracing a circular disk which really constitutes a crank pin 164 se cured to the face of the ear 39, as by screws 165. The casting whic forms this crank 7o pm or eccentrically mounted disk is also formed with another disk-shaped ortion 166, as indicated by dotted lines in ig. 2, this constitutin another crank or eccentrically mounted isk, the two cranks or disks' 75 being carried at substantially diametrical points of the axis of rotation of the gear 39; A pitman 167 connects the crank 166 withv an arm 168 of the rockshaft 157. l

The mechanism just described imparts a peculiar motion tothe needle, said needle having a dwell and slight recession of movement to release the thread so that the shuttlev will not strip the latter. This motion is obtained through the operation of the two 85 parallel pitmen 163 and 167. The itman 163 impartsa uniform motion of oscillation to the disks 158, 159, and since the said disks form bearings for the rockshaft 157, the latter of course swings within the arc slot 162. At the same time the pitman 167 acts through the arm 168 to rock the shaft 167 on its own axis. The resultin motion is one difficult to describe, but it 1s believed that it will be understood that the arm 166 at the 95 other end of the rockshaft 167 has such motion imparted to it that, through the link 155, a curved needle is reciprocated so -as not only to penetrate the work and perform the usual functions of a curved sewing 100.

needle, butalso to have a ldwell in the upper portion of this motion so as to slacken the needle thread as hereinbefore described.

I will now describe' the connections for operating the awl. An arm 169 (Figs. 4, 5 105 and 21), rigidly connected to the disk 159, has pivotally connected to its outer end'a link 170, the up er end of which is pivoted to a yoke 171, w ich latter is in turn ivotally connected at 172 to a rearward y ex. 10 tending arm of the awl carrier 173, the latter having a suitable awl 174. The ivotal connection between the link 1.70 an yoke 171 is transverse relatively to the pivot 172, thc reason for this being to prevent strain on the operating connections when the awl carrier is reciprocated in the direction of its axis of movement, when feeding.

The awl carrier 173 is mounted to oscillate on a pin 175- (Fig. 5) carried by a 1z0 bracket 176 Figs. 1,3 and 6). The awl carrier is sli lengthwise of said pin, for feeding, by the following mechanism. vA yoke 177 at the upper end of an arm -178 engages an annular groove in the hub of the 125 awl carrier.. Said. arm 178 is carried by" a slide 179 (Fig. 19) mounted to reciprocate in a bearing 180 formed in the frame of the machine." The slide 179 is pivotally connected at 181 to one end of a straight vlever 131e 182, which has an adjustable fulcrum presently described. The other end of the lever 182 has a roll 183 which enters a cam groove 181 (Figs. 1, 3 and 6)' formed in a disk carried by the shaft 31. By adjusting the fulcrum of the lever 182 the length of feed may be varied. I will now describe the means for adjusting said ulcrum. A suitably supported `bracket 185 is formed with, a cylindrical bearing 186 (Fig. 19) in which a tubular block 187 is mounted to slide longitudinally of said bearing. The block 187 is formed or provided with a rack 188 engaged by a pinion 189 rotatably mounted in a suitable bearing adjacent the bearing 186, said pinion having at its lower end (Fig. 20) a stud or pin 190 on which is secured the split hub 191 of a handle 192. The said split hub is clamped on the stud end 190 by a screw 193. To secure additionally the handle in place a screw 194 may be employed, said screw tting a threaded hole in the end of the stud 190. The tubular block 187 is provided with bearings for the trunnions 195 of a sleeve 196 (Figs. 19 and 20) which forms the slidably adjustable fulcrum for the lever 182. By operating the handle 192, the block 187 is shifted longitudinally,carrying With it of course the 'fulcrum sleeve 196. The space Within the block 187 is sufficiently larger than the external diameter o the fulcrum sleeve 196, to permit the latter to oscillate. Preferably the ulcrum sleeve 190 is tapered toward each end, as shown in Fig. 19, to permit ot' such oscillations without employing a large block 187. The cam hereinbefore described which actuatcs the lever 182 imparts sufficient movement to the slide 179,

and, through the parts described, to the' awl, to produce a longer or shorter stitch according to the position of the ulcrum sleeve.

As is well known, it is desirable always to be able to manually adjust or vary the length of stitch within said limits, which limits are then'iselves adjustable. The handle 192 enables the length to be quickly and manually varied. To limit adjustably the amount ot variation of length of stitch, I provide the upper stud end 197 of the pinion 189 with stop fingers 199` said stop fingers being above a fixed dial or gage plate 198 (Figs. (E and 20). The stop fingers 199 are provided with split hub port-ions which can ha clamped upon the stud 197 in any desired position ot adjustment, and when have heen fixedly secured as desired, i-.operale with opposite sides ot a stop pin 200 to limit the amount of rn l.montait that may he imparted to the. linien 18) by the handle 192.

"the looper 201 comprises a tubular member at the outer end ot an arm 202 (Figs. 1 and 4), said arrn projecting from a hub 203 mounted to oscillate laterally by means of slots 203x in said hub, which slots receive trunnions 201 projecting from a fulcrum block 205 that is contained Within the hub 208, said block 205 being pivotally supported upon a pin 206 projecting inwardly from the standard 81. This mounting of the hub 208 is simply to enable it to have universal movement, and, Aas any other universal mounting may be substituted therefor, I do not show the extreme specific details of said mounting. An arm 207 projecting rearwardly from the hub 208 is provided with a. ball 208 freely movable therein. This ball 208 is provided with a shank 208 slidably mounted in one end of a lever 209 which is mounted on a universal pivot 210, said lever 209 (see Fig. 4) having a roll 211 which is acted upon by a cam 212 carried by the shaft 34. As the universal mounting of the lever 209, like that described for the hub 203, may be of any preferred well-known type, it is not necessary to illustrate it in detail. The lever 209 is providedfwith slots 209c to receive the trunnions 210* of the pivot member 210, these slots 209x providing means whereby said lever 209 may be oscillated laterally. A cam 212 is peripherally formed to act upon the roll 211 so as to impart to the looper its in-and-out movements, a suitably connected spring 213 (Fig. L) causing the lever to follow suoli movements of the cam. Said cam is formed with a groove 214 (Figs. 6 and 7), which groove receives a roll 215 indicated by dotted lines in Fig. 4, said roll being mounted on a pin carried by the lever 209. The cam groove 21-1 imparts to the lever the motions which transmit lateral motions to the lcoper. The combined cam action is such of course that the looper has no movements in a straight line. said looper having in practice a motion which might be bes described as 'following the path somewhat of the numeral 6 so as to carry the thread around the needle and then to move to a greater distance from the needle, and then return. lt is obvious that' during this'operation the shank 208* of the ball 208 will reciprocate in the .socket provided therefor in the end of the lover 209.

The loop spreader comprises a hookshnped mouiller 211' (Fig. iii) formed at tho end of' the curved portion 217 (Figs. 1, 3 and 5l of a roollsliafhllS mounted in a beat'- ing 219 supported by a suitable, bracket 220. The rear end ot the rorkshaft 218 has an arni 221 connected by a link 222 with the outer ond of an arin 228 (Figs. f5. o and 1-1) which is pivotalhy supported on the sleeve 81 hereinlwfore described. At the point where. the` link 222 and arm 22?. are connected, a roll 224 is mounted. said roll entering t-he cam groove 111 in the disk J2. The object of the swinging arm 223 is to justable longitudinally keep the roll 224 in proper position to be acted 'upon by the cam groove 111. Said cam groove 11, as will now be under stood, serves to actuate not vonly the loop spreader but also the presser foot lock .hereinbefore described.

As indicated inFig. 4, a suitable oscillating guide for the needle is indicated at 225. I'do not show the details of the mounting of said needle guide so that `it can oscillate, as the same may be constructed as in my application 664,769, liled August 18, 1911.

To hold the loop of thread aside for the needle to pass through the loop formed by the looper 201, I provide a simple and durable device consisting of a projection or hook 226 (Fig. 4) which isconnected to the needle carrier in such position that the end of said hook or loop holder will be in advance vof the tip of the needle. In operation-this hook moves to a low enough point so that the looper 201 will carry the thread around 1t just before the needle enters the loop.

In 'order that the presser foot may be lifted whenever desired by the operator, I

'provide such a structure as illustrated in Fig. 5, the arm of the presser foot having a rearwardly extending lug or projection 227 in position to be engaged by one end of a lever 228 pivoted at 229 to any suitable part ofthe machine, the other or rear end of the lever 228 extending over the upper end of the rod 114 which, as hereinbefore explained, may be operated by a treadle not shown. Normally the space between the upper end of the rod 114 andl the rear end of the lever 228 is such that it is only during the last portion of the upward movement of the rod 114 that the lever 226 is actuated to raise the presser foot.

Having described mv invention, I claim:

.1. In a sewing machine, the combination with the stitch forming mechanism thereof,c

of an oscillating awl, a slide for shifting the awlin the direction of its axis of oscillation, a lever for actuating the slide.'a sleeve adjustable longitudinally of said lever, a tubular block in which said sleeve is pivotally mounted, and means for adjusting said.

tubular block-in the direction of the length of said lever.

2. .In a sewing` machine, the combination withthe stitch forming mechanism thereof, of an oscillating awl, a slide for shifting the awl in the direction of its axis of oscillation, a lever for ,actuating the slide, a sleeve adof said lever, a tubular block in which said sleeve is pivotally mounted, said tubular block having a rack, a pinion engaging said rack, and a handle for manually rotating said pinion.

In a sewing machine, the combination `with the stitch forming mechanism thereof,

of an oscillating awl, a slide for shifting the lengthwise of awl in the direction of itsA axis of oscillation, a lever for actuating the slide, a sleeve adjustable longitudinally lar block in which said sleeve is pivotally mounted, said tubular block having a rack, a pinion engaging said rack, a handle-for manually rotating said pinion, and meaiils for adjustably determining the limits 06f movement of the pinion and rack.

4. In a sewin with the .stitch ormingA mechanism thereof, of an oscillating awl, a slide for shifting the awl in the direction of its a lever for actuating the justable longitudinally of lar block in which said sleeve is pivotally mounted, saidtubular block having a rack,

a pinion engaging said rack, a handle for of said lever, a tubu' machine, the combination' axis of gjscillation, slide, a sleeve adl said lever, a tubu-- manually rotating said pinion, and means A for adjustably determining' the llimits ,of

movement .of the pinion and rack, said means comprising a pair of fingers adjustably secured to one end of the pinion, and a stop pin mounted between said fingers.

5. In a sewing machine, the combinationl -1 the stitch-forming mechanism thereof,

oscillating awl, a slidable member. for

er, a pivot member` movable r;

ioo

slidable member, a-pivot member movable said lever, a slidable block adapted to receive the pivot thereof and provided with a rack, a revoluble pinion meslb ing with said rack, handle for rotating said pinion.

In a sewing machine, the combination with the stitch-forming mechanism thereof, of an oscillating awl, a slidable member for shifting` the awl in the direction of its'axis of oscillation, a lever for .actuating said slidable member, a sleeve movable lengths wise of and surrounding said lever and provided with a projecting pivot, a slidable block adapted to receive said pivot, and means removed from said lever 'for adjusting said block in the direction of the length of said lever.

8. In a sewing machine,

and a manually operatedl the combinationv with the stitch forming mechanism thereof,

of lain-oscillating awl', a slidable member for shifting the awl -in the .direction of its axisV of oscillation;

a lever for actuating saidA slidable member,

a sleeve movable lengthwise of said lever and provided with a projecting,v

1,137,198 l A I7 pivot, aslidable block adapted to receive said position of said block, and a member freely pivot, and having a rack thereon, and a movable lengthwise of said lever and movrevoluble pinion meshing With said rack. able endwise thereon pivotally connected to 9. In a sewing machine, the combination said block. 5 with the stitch forming meohanism'thereof, In testimony whereof I have affixed my 15 of an oscillating awl, a slidable member for signature, in presence of two Witnesses.

shifting the awl in the direction of its axis EDWARD ERICKSON. of oscillation, a lever for actuating said lVitnesses: slidable member, an adjustable block, means A. W. HARRISON,

I0 removed from said leverl for adjusting the P. W. PEZZETTI. 

